Effect of bypass ratio on sonic underexpanded co-flow jets with finite lip thickness

The characteristics of a sonic under-expanded coaxial jet with lip thickness 1.5 (where is the exit diameter of primary jet equals 10 mm) with the primary jet operating at nozzle pressure ratio (NPR) of 3, 4 and 5. For NPR 3 operating primary jet, the secondary jet operates at NPR 2.5, 1.4 and 1.27....

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Published inInternational journal of turbo & jet-engines Vol. 40; no. 1; pp. 475 - 484
Main Authors Radha Krishnan, Naren Shankar, Kumar, Sathish Kumar, Kengaiah, Vijayaraja, Chidambaram, Senthilkumar, Rathakrishnan, Ethirajan
Format Journal Article
LanguageEnglish
Published De Gruyter 16.11.2022
Subjects
coaxial flow
jet core
primary jet
secondary jet
shadowgraph
sonic jet
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Summary:The characteristics of a sonic under-expanded coaxial jet with lip thickness 1.5 (where is the exit diameter of primary jet equals 10 mm) with the primary jet operating at nozzle pressure ratio (NPR) of 3, 4 and 5. For NPR 3 operating primary jet, the secondary jet operates at NPR 2.5, 1.4 and 1.27. For primary jet NPR 4, the secondary jet operating NPR is 3.2, 1.6 and 1.4. For NPR 5 primary jet, the secondary jet NPR is 3.8, 1.89 and 1.52. The study is performed using a co-flow nozzle of bypass ratio (BR) 6.4, 1.4 and 0.7. The core length of the primary jet is used as a measure to quantify the mixing of the primary jet in the presence of coaxial jet. The shock structure present in the near field was viewed using shadowgraph technique. Centreline pitot pressure distribution, radial spread and waves present in the jet core were analyzed. The results show that the mixing associated with the high bypass coaxial jet is superior to the low bypass coaxial jet. This mixing superiority associated with high bypass coaxial jet prevails all levels of expansion.
ISSN:0334-0082
2191-0332
DOI:10.1515/tjj-2022-0068